GMT

In orderfor developers to hold onto GMT PostScript output when using the API we must add a new GMT resource. It may be as simple as

struct GMT_PS {
   char *text; /* Buffer with all PostScript */
   size_t n_alloc; /* Memory allocated so far */
   size_n n; /* Position of where to write next (i.e., length of PS so far) */
};

Thus, to receive PS back to one's program in memory it follows the same scheme for any other output:

1. Create an empty GMT_IS_PS resource for output
2. Get its ID and create a special filename @GMTAPI@-######
3. Use this filename as the destination for where PS is to be written
4. Deal with the PS→text as you see fit, write it to file with GMT_Write_Data, etc.
5. Remove with GMT_Destroy_Data (API, GMT_IS_PS, PS), etc.